www.becker-international.com
28100241500 05/18
Operating Instructions
Frequency converters
VAU 4/4
VAU(w) 7.5/3
VAU 11-22/3
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Contents
1 General information ......................................................................................................4
1.1 Notes relating to the documentation .........................................................................................4
1.1.1 Warnings .......................................................................................................................................4
1.1.2 Warning symbols used ..................................................................................................................4
1.1.3 Signal words ..................................................................................................................................5
1.1.4 Information notices ........................................................................................................................5
1.2 Markings at the frequency converter ........................................................................................5
1.3 Qualied personnel .....................................................................................................................6
1.4 Intended use ................................................................................................................................6
1.5 Responsibility .............................................................................................................................. 7
1.6 CE marking ..................................................................................................................................7
1.7 Safety information ....................................................................................................................... 7
1.7.1 General .........................................................................................................................................7
1.7.2 Transport and storage ...................................................................................................................8
1.7.3 Notes for commissioning ............................................................................................................... 8
1.7.4 Notes for operation ......................................................................................................................10
1.7.5 Maintenance and inspection ....................................................................................................... 11
1.7.5.1 Cleaning of frequency converters ............................................................................................... 11
1.7.5.2 Measuring the insulation resistance at the control terminals ...................................................... 11
1.7.5.3 Measuring the insulation resistance at the power terminals ....................................................... 11
1.7.5.4 Pressure test in a VAU ................................................................................................................12
1.7.6 Repairs ........................................................................................................................................12
2 Frequency converter overview ..................................................................................13
2.1 Scope of delivery ......................................................................................................................13
2.2 Description of frequency converter VAU ................................................................................14
3 Installation ...................................................................................................................14
3.1 Safety information for installation ...........................................................................................14
3.2 Installation requirements .........................................................................................................14
3.2.1 Suitable ambient conditions ........................................................................................................14
3.2.2 Connection versions VAU 4/4 & VAU(w) 7.5/3 ............................................................................15
3.2.3 Connection version VAU 11-22/3 ................................................................................................17
3.2.4 Short circuit and earth leakage protection ...................................................................................18
3.2.5 Cabling instructions .....................................................................................................................18
3.2.6 Avoidance of electromagnetic interferences ...............................................................................21
3.3 Installation of a frequency converter integrated into the motor ...........................................21
3.3.1 Mechanical installation ................................................................................................................21
3.3.1.1 Mechanical installation of the VAU 4/4 & VAU(w) 7.5/3 ..............................................................21
3.3.1.2 Mechanical connection of the water cooling of the VAUw 7.5/3 .................................................. 23
3.3.1.3 Mechanical installation of the VAU 11-22/3 .................................................................................24
3.3.2 Connection space .......................................................................................................................25
3.3.3 Power connection ........................................................................................................................26
3.3.3.1 Power connection of the VAU 4/4 & VAU(w) 7.5/3 ......................................................................26
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3.3.3.2 Power connection of the VAU 11-22/3 .........................................................................................27
3.3.4 Brake resistance connections (VAU 4.4 & VAU(w) 7.5/3 only) ....................................................27
3.3.5 Control connections ....................................................................................................................28
3.3.6 Relays .........................................................................................................................................29
3.3.7 RS485 interface ..........................................................................................................................29
3.4 Local operation and display .....................................................................................................30
3.5 Optional accessories ................................................................................................................30
3.6 Installation of a wall-mounted frequency converter ..............................................................31
3.6.1 Suitable installation location for wall mounting ............................................................................31
3.6.2 Mechanical installation ................................................................................................................31
3.6.3 Power connection ........................................................................................................................34
3.6.4 Brake chopper .............................................................................................................................34
3.6.5 Control connections ....................................................................................................................34
4 Commissioning ...........................................................................................................35
4.1 Safety information for commissioning ...................................................................................35
4.2 General information ..................................................................................................................35
4.2.1 KombiTool ...................................................................................................................................36
4.3 Basic conguration ................................................................................................................... 36
4.3.1 Pressure/vacuum mode ..............................................................................................................36
4.3.2 Operating mode ..........................................................................................................................36
4.3.2.1 Speed-controlled operation .........................................................................................................36
4.3.2.2 Sensorless control (internal control) ............................................................................................37
4.3.2.3 Process control (sensor-guided PID control) ..............................................................................37
4.3.3 Setpoint origin .............................................................................................................................37
4.3.4 Start/stop origin (release) ............................................................................................................ 37
4.4 Block diagram ...........................................................................................................................38
5 Parametrisation ...........................................................................................................39
5.1 Parameter description ..............................................................................................................39
5.2 Diagnostic parameters .............................................................................................................52
6 Error detection and removal ......................................................................................53
6.1 List of errors and system faults ...............................................................................................53
6.2 Table of possible error messages ...........................................................................................54
7 Disassembly and disposal .........................................................................................57
7.1 Disassembly of the frequency converter ................................................................................ 57
7.2 Information for correct disposal ..............................................................................................57
8 Technical data .............................................................................................................. 58
8.1 General data ..............................................................................................................................58
8.2 Derating of the output power ...................................................................................................60
8.2.1 Derating due to increased ambient temperature ......................................................................... 60
8.2.2 Derating due to installation altitude .............................................................................................61
8.2.3 Derating due to cycle frequency ..................................................................................................61
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9 Approvals, standards and directives ........................................................................62
9.1 EMC limit classes ......................................................................................................................62
9.2 Classication according to IEC/EN 61800-3 ...........................................................................62
9.3 Standards and directives .........................................................................................................62
9.4 UL approval ................................................................................................................................63
9.4.1 UL specication (English version) ...............................................................................................63
9.4.2
Homologation CL (version en française) ............................................................................... 65
10 Information for maintenance and service .................................................................68
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1 General information
1.1 Notes relating to the documentation
The following information explains how to navigate through the documentation. Read these instructions
carefully. They contains important information for operating the frequency converter (VAU). We assume no
liability for any damage resulting from non-observance of these instructions.
These instructions form part of the product and apply exclusively to the VAU series (VARIAIR UNIT) of
Gebrüder BECKER GmbH.
Make sure to hand these instructions to the plant operator to be readily available when required.
Store these instructions and all other applicable documents carefully to be readily available when required.
1.1.1 Warnings 4
The warnings refer to life-threatening dangers. Serious injuries possibly resulting in death may occur.
Each warning consists of the following elements:
DANGER
Mortal danger from electric shock!
Death or serious injury!
Disconnect the frequency converter from the voltage supply and protect it against re-activation.
Fig. 1: Structure of warnings
- warning symbol
- signal word
- type and origin of the danger
- potential consequence(s) of non-compliance
- remedy
1.1.2 Warning symbols used
Danger (general)
Danger from electric shock and electrical discharge
Danger from hot surfaces!
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1.1.3 Signal words
Signal words are used to identify the severity of the danger.
DANGER
Indicates a direct hazard with a high level of risk, which, if not avoided, will result in death or
serious injury.
WARNING
Indicates a hazard with a moderate level of risk, which, if not avoided, will result in death or
serious injury.
CAUTION
Indicates a hazard with a low level of risk, which, if not avoided, may result in minor or moder-
ate injury or property damage.
1.1.4 Information notices
Information notices contain important instructions for the installation and trouble-free operation of the
frequency converter. They must be complied with at all times. The information notices also point out that
non-compliance may result in property or nancial damages.
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IMPORTANT INFORMATION
The frequency converter may only be assembled, operated, maintained or installed by trained and
qualied personnel.
Fig. 2: Example of an information notice
1.2 Markings at the frequency converter
Fig. 3: Markings at the frequency converter
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Signs and labels have been afxed to the frequency converter. These may not be altered or removed.
Symbol Meaning
Danger from electric shock and electrical discharge
2 mim
Danger from electric shock and electrical discharge. Wait two minutes (discharge time of
the capacitors) after shut-down
Additional earth connection
1.3 Qualied personnel
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IMPORTANT INFORMATION
All work related to transport, installation and commissioning as well as maintenance must only be
carried out by qualied personnel (comply with IEC 364 or CENELEC HD 384 or DIN VDE 0100
and IEC 664 or DIN VDE 0110 and national accident prevention regulations).
Qualied personnel in the meaning of these operating instructions are electricians who are familiar
with the installation, assembly, commissioning and operation of the frequency converter and the
related dangers. On account of their technical training they are further familiar with the relevant
standards and regulations.
1.4 Intended use
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IMPORTANT INFORMATION
The frequency converter VAU is a device for speed control in three-phase rotary current motors.
The frequency converter can be integrated in the motor (with the standard adapter plate) or tted
close to the motor (with the wall installation adapter plate).
Frequency converters are components intended for installation in electrical systems or machinery.
This frequency converter has not been approved for operation in explosive areas!
When installed in machinery the commissioning of the frequency converters (i.e. commencing
their intended use) is prohibited until it has been established that the machine meets the provi-
sions of the Machinery Directive applicable at the time of commissioning, incl. the EMC Directive;
EN60204 must be complied with.
The harmonised standards of DIN EN 50178; VDE 0160:1998-04 must be applied to this frequency
converter in conjunction with DIN EN 60439-1; VDE 0660-500:2005-01.
The frequency converters meet the requirements of the EC Machinery Directive 2006/42/EC.
The technical data and information on the connection conditions can be found on the rating plate
and in these instructions and must always be adhered to.
Repairs may only be carried out by authorised repair centres. Independent and unauthorised
interventions may result in death, injury or property damage. This invalidates the warranty by Ge-
brüder BECKER GmbH.
External mechanical loads, such as stepping onto the housing, are not permitted!
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IMPORTANT INFORMATION
Using frequency converters in movable equipment amounts to an unusual ambient condition and
is only permitted in accordance with the locally applicable standards and guidelines.
1.5 Responsibility
Electronic devices are not generally fail-safe. The installer and/or operator of the machine or plant is re-
sponsible for ensuring that the drive switches to a safe state if the device fails.
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The “Electrical equipment of machines” section in DIN EN 60204-1; VDE 0113-1:2007-06, “Safety of ma-
chinery” describes the safety requirements for electrical control units. These are provided for the safety of
people and machines and must be observed in order to retain the functional capability of the machine or plant.
An emergency stop feature does not necessary cause the power supply to the drive to be switched off. To
avoid dangerous situations, it may be useful for individual drives to remain operational or for specic safety
procedures to be initiated. The effectiveness of emergency stop measures is evaluated by means of a risk
assessment for the machine or plant and its electrical equipment and is determined by selecting a circuit
category according to DIN EN 13849 “Safety of machinery – Safety-related parts of control systems”.
1.6 CE marking
The CE marking conrms that the frequency converters meet the basic requirements of the following Di-
rectives:
Directive on Electromagnetic Compatibility (Directive 2004/108/EC of the Council EN 61800-3:2004).
Low Voltage Directive (Directive 2006/95/EC of the Council EN 61800-5-1:2003).
1.7 Safety information
The following warnings, precautionary measures and information are provided for your safety and serve
to prevent damage to the frequency converter and the components connected to it. This chapter contains
warnings and information which apply in general to the handling of frequency converters. They are divided
into general information, transport & storage and disassembly & disposal.
Specic warnings and comments which apply to specic activities can be found at the start of the appropri-
ate chapters and are repeated or added to at various critical points in these chapters.
Please read this information carefully as it is provided for your personal safety and will also prolong the life
of the frequency converter and connected devices.
1.7.1 General information
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IMPORTANT INFORMATION
Carefully read these operating instructions and the warning signs afxed to the frequency converter
prior to installation and commissioning. Make sure that all warning signs afxed to the frequency
converter are legible; replace any missing or damaged signs.
They contain important information on the installation and operation of the frequency converter. In
particular, note the information under "Important information". Gebrüder BECKER GmbH assumes
no liability for damages arising from the non-compliance with these operating instructions.
These operating instructions form an integral part of the product. They apply exclusively to the
frequency converters of the VAU series from Gebrüder BECKER GmbH.
Keep the operating instructions near the frequency converter to be easily accessible to all users.
The frequency converter can only be operated safely if the required ambient conditions found in
chapter 3.2.1 have been met.
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WARNING
Mortal danger from re or electric shock!
Death or serious injury!
Always use the frequency converter as intended.
Do not modify the frequency converter.
Only use spare parts and accessories sold or recommended by the manufacturer.
During assembly, ensure adequate distance to adjacent components.
CAUTION
Risk of burns from hot surfaces!
Serious skin burns from hot surfaces!
The heat sinks and all other metal components may heat up to temperatures exceeding 70°C.
During assembly adequate distance must be maintained to adjacent components.
When working on the components provide for an adequate cooling-down period.
If necessary, install protection against accidental contact.
1.7.2 Transport and storage
Damage to property possible
Risk of damage to the frequency converter!
Risk of damage to the frequency converter from improper transport, storage, installation and as-
sembly!
Transport the frequency converter properly in its original packaging.
Always store the frequency converter properly.
Only allow qualied personnel to carry out installation and assembly.
1.7.3 Notes for commissioning
Electrical connection
Frequency converters are equipment to be used in industrial high voltage systems and are operated
with voltages which can cause serious injury or death upon contact.
Installation and work may only be carried out by qualified electricians with the
equipment disconnected from the voltage supply. These individuals must always have access to
the operating instructions which they must consistently adhere to.
DANGER
Mortal danger from to electric shock!
Death or serious injury!
Disconnect the frequency converter from the voltage supply and protect it against re-activation.
The following terminals may still carry dangerous currents even when the motor is not running:
- Supply terminals X1: L1, L2, L3
- Motor connection terminals X2: U, V, W
- Connection terminals X6, X7: Relay contacts for relays 1 and 2
- PTC/bimetallic switch connection terminals T1/ T2
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IMPORTANT INFORMATION
When working on live frequency converters, the applicable national accident prevention regula-
tions (e.g. VBG 4) must be complied with.
The local regulations pertaining to the installation of electrical systems and accident prevention
regulations must be complied with.
The electrical installation must be carried out in accordance with the relevant regulations (e.g.
conductor cross sections, fuse protection, protective earth connection).
If personal and re protection are required during the use of the frequency converter, all-current
sensitive RCDs of type B must be used (in accordance with DIN VDE 0160 and EN 50178).
These provide reliable protection for the high frequency alternating currents and smooth and
pulsating DC fault currents arising during frequency converter operation. Standard RCD devices
of type A are not permitted.
Only use permanently wired mains connections.
Earth the frequency converter in accordance with DIN EN 61140; VDE 0140-1.
Contact currents > 3.5 mA may occur in the VAU. In this case an additional protective earth
conductor with the same cross section as the original earth conductor must be tted In accord-
ance with DIN EN 61800-5-1. The respective equipment instructions will provide information as
to whether the equipment requires additional earthing. A second protective earth conductor can
be connected below the mains supply (position marked with a mass symbol) on the outside of
the device. A suitable M6x15 screw (4.0 Nm torque) is provided with the adapter plate.
If different voltages levels are used (e.g. +24 V/230 V), crossing cable runs are not permitted
under any circumstances! The operator must also ensure compliance with the applicable regula-
tions (e.g. double or reinforced insulation according to DIN EN 61800-5-1)!
The circuit boards contain highly sensitive MOS semiconductor elements which are particularly
sensitive to static electricity. Conductor paths or components must therefore not be touched by
hand or with metal objects. Only the screws of the terminal strips may be touched with insulated
screwdrivers when connecting the cables.
In a residential environment, this product can cause high-frequency interferences which might
necessitate interference suppression measures!
Information on EMC-compliant installation, such as shielding, earthing and cable routing, can be
found in the documentation of the frequency converters. This information must always be complied
with, even for frequency converters bearing the CE mark. The compliance with the limits required
by EMC legislation is the responsibility of the plant or machine manufacturer.
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1.7.4 Notes for operation
DANGER
Mortal danger from electric shock!
Death or serious injury!
2 mim
Due to its charged capacitors, the equipment might still carry dangerous voltages for up to 2
minutes after being disconnected from the mains.
Contact with bare or unused terminals, conductors or equipment components may result in
serious injury or death!
Therefore, the equipment may only be opened or the covers or control unit removed 2 minutes
after the equipment has been disconnected from the mains.
Even with the motor at rest (e.g. due to electronic lock, blocked drive or short-circuited output
terminals) the mains supply terminals, motor terminals and terminals for the brake resistance
might carry dangerous voltages. A stopped motor does not imply electrical separation from the
mains.
DANGER
Mortal danger from revolving mechanical parts!
Death or serious injury!
With certain congurations the converter may start automatically after activation from the mains.
Systems integrated into the frequency converters might need to be equipped with additional monitoring
and protection devices in accordance with the respective applicable safety regulations, e.g. laws relating
to technical operating equipment, accident prevention regulations etc.
Unauthorised removal of the required covers, improper use and incorrect installation or operation pose
risk of serious injury or property damage.
All covers must remain closed during operation.
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IMPORTANT INFORMATION
Observe the following instructions during operation:
The frequency converter operates with high voltages.
During the operation of electrical equipment, some of their parts are inevitably carrying danger-
ous voltages.
Emergency stop devices according to DIN EN 60204-1; VDE 0113-1:2007-06 must remain op-
erational during all operating modes of the control unit. Resetting the emergency stop devices
must not lead to uncontrolled or undened reactivation.
To ensure safe disconnection from the mains, the mains cable must be completely disconnected
from the frequency converter in a synchronous manner at all poles.
For VAU 11-22/3 a pause of at least 1 to 2 min. must be observed between successive mains
activations.
Certain parameter settings may result in the frequency converter restarting automatically after
a supply voltage failure.
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Damage to property possible
If this information is not observed, the frequency converter could be damaged and destroyed during
subsequent commissioning!
Observe the following instructions during operation:
The motor parameters, especially the I2T settings, must be congured correctly to provide proper
motor overload protection.
The frequency converter features an internal motor overload protection. Motor overload protec-
tion can also be ensured via an external PTC/bimetallic switch.
The frequency converter must not be used as an "emergency stop device" (see DIN EN 60204-
1; VDE 0113-1:2007-06).
1.7.5 Maintenance and inspection
Frequency converters may only be maintained and inspected by trained electricians. Unless explicitly stated
in these instructions, modications of hardware and software may only be carried out by persons authorised
by Gebrüder BECKER GmbH.
1.7.5.1 Cleaning of frequency converters
Frequency converters are maintenance-free if operated as intended. If the air contains dust, the cooling
ns of the motor and frequency converter must be cleaned regularly.
1.7.5.2 Measuring the insulation resistance at the control terminals
An insulation test on the control board's input terminals is not permitted.
1.7.5.3 Measuring the insulation resistance at the power terminals
The power component of the VAU is tested with 1.9 kV during series testing.
Should the insulation resistance need to be measured during a system test, this can be done under the
following conditions:
An insulation test may only be carried out for the power component.
To avoid excessively high voltages, all the connection cables of the VAU must be disconnected before
testing,
A 500 V DC insulation tester should be used.
Fig. 4: Insulation test at the power component
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1.7.5.4 Pressure test in a VAU
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IMPORTANT INFORMATION
A pressure test is not permitted in a standard VAU.
1.7.6 Repairs
Damage to property possible
If this information is not observed, the frequency converter could be damaged and destroyed during
subsequent commissioning!
Repairs of the frequency converter may only be carried out by the Service department of Ge-
brüder BECKER GmbH.
DANGER
Mortal danger from to electric shock!
Death or serious injury!
Disconnect the frequency converter from the voltage supply and protect it against re-activation.
2 mim
Due to its charged capacitors, the equipment might still carry dangerous voltages for up to 2
minutes after being disconnected from the mains.
Contact with bare or unused terminals, conductors or equipment components may result in
serious injury or death!
Therefore, the equipment may only be opened or the covers or control unit removed 2 minutes
after the equipment has been disconnected from the mains.
Related information signs afxed to the frequency converter must be observed.
Even with the motor at rest (e.g. due to electronic lock, blocked drive or short-circuited output
terminals) the mains supply terminals, motor terminals and terminals for the brake resistance
might carry dangerous voltages. A stopped motor does not imply electrical separation from the
mains.
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2 Frequency converter overview
2.1 Scope of delivery
Compare the scope of delivery of your product with that provided below.
Fig. 5: Scope of delivery
Key
1 Frequency converter (version) 5 Adapter plate with connection terminal (optional)
2 Poly bag containing fastening bolts 6 Poly bag containing connection material for
terminal block (optional)
3 Cable glands 7 Seal (optional)
4 Operating instructions 8 Motor (not included in the scope of delivery)
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2.2 Description of frequency converter VAU
The frequency converter VAU is a device for speed control in three-phase rotary current motors.
The frequency converter can be integrated in the motor (with the standard adapter plate) or tted close to
the motor (with the wall installation adapter plate).
The permitted ambient temperatures specied in the technical data (chapter 8) refer to operation at nominal
load.
3 Installation
3.1 Safety information for installation
DANGER
Mortal danger from revolving mechanical parts!
Death or serious injury!
Disconnect the frequency converter from the voltage supply and protect it against re-activation.
Only allow installation by appropriately qualied personnel.
Only use personnel trained in assembly, installation, commissioning and operation.
Always earth the equipment in accordance with DIN EN 61140; VDE 0140, NEC and other relevant
standards.
Mains connections must be permanently wired.
3.2 Installation requirements
3.2.1 Suitable ambient conditions
Conditions Values
Altitude of the installation site: up to 1000 m above MSL / more than 1000 m with reduced perfor-
mance (1 % per 100 m) (max. 2000 m), see chapter 8.2
Ambient temperature: -25 °C to +50 °C (different ambient temperatures may be possible
in individual cases), see chapter 8.2
Relative humidity: ≤ 96%, condensation not permitted.
Resistance to vibration and shock: DIN EN 60068-2-6 severity 2 (vibration from transport)
DIN EN 60068-2-27 (vertical impact test)
2…200 Hz for sinusoidal vibrations.
Electromagnetic compatibility: Immune to interference according to DIN EN 61800-3
Cooling: Surface cooling:
VAU 4/4 & VAU 7.5/3: free convection;
VAU 7.5/3: optionally with integrated fan;
VAU 11-22/3: with integrated fans.
Water cooling:
VAUw 7.5/3: with integrated water cooler
Table 1: Ambient conditions
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Ensure that the housing type (protection class) is suitable for the operating environment:
- Ensure that the seal between the motor and the adapter plate is inserted correctly.
- All unused cable glands must be sealed.
- Check that the cover of the frequency converter is closed and bolted down with the following torque:
VAU 4/4 & VAU 7.5/3 (4 x M4 x 28) 2 Nm,
VAU 11-22/3 (4 x M6 x 28) 4 Nm.
Damage to property possible
Non-compliance may result in the loss of the protection class over time (particularly in respect to seals
and optical bres).
If circuit boards are being removed, the warranty is invalidated!
Mounting points and sealing surfaces must be kept free of paint for purposes of EMC and grounding!
3.2.2 Connection versions VAU 4/4 & VAU(w) 7.5/3
Fig. 6: Star or delta circuit for frequency converter integrated in the motor
DANGER
Mortal danger from to electric shock!
Death or serious injury!
Disconnect the frequency converter from the voltage supply and protect it against re-activation.
Unused open cable ends in the motor terminal box must be insulated.
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Connection version with 3 conductors (star/delta circuit already established in the motor)
Triangle connection variant
Star connection variant
Key
1 Nut MA = 5Nm 3 Plain washer
2 Circlip 4 Cable lug / wire end sleeve
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IMPORTANT INFORMATION
Regularly check that the nuts (1) are secure!
Damage to property possible
Risk of damage to the motor.
Correct phase assignment must be observed when connecting the frequency converter. Otherwise
the motor may be overloaded.
The supplied assembly material can be used to connect both wire end sleeves and cable lugs. Fig. 6 shows
the different connection options.
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IMPORTANT INFORMATION
If the motor is tted with a temperature sensor (PTC or bimetallic switch), this is connected to the
T1 and T2 terminals (1).
Remove the bridging contact inserted for delivery purposes.
The cross section of the supply line must be designed according to the installation type and maximum per-
mitted current. The contractor commissioning the device must ensure protection for the mains power line.
3.2.3 Connection version VAU 11-22/3
DANGER
Mortal danger from to electric shock!
Death or serious injury!
Disconnect the frequency converter from the voltage supply and protect it against re-activation.
Unused open cable ends in the motor terminal box must be insulated.
Connection version with 3 conductors (star/delta circuit already established in the motor)
PE
U
V
W
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IMPORTANT INFORMATION
If the motor is tted with a temperature sensor (PTC or bimetallic switch), this is connected to the
T1 and T2 terminals (1).
Remove the bridging contact inserted for delivery purposes.
The cross section of the supply line must be designed according to the installation type and maximum
permitted current. The contractor commissioning the device must ensure protection for the power line.
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3.2.4 Short circuit and earth leakage protection
The frequency converter contains an internal short circuit and earth leakage protection.
3.2.5 Cabling instructions
The frequency converter includes a terminal block with control connections.
Control terminals (all VAU series)
Fig. 7: Control terminals
all VAU series
X5 – X7 Terminals: Plug-in terminal connection with actuation lever
(at head screwdriver, max. width 2.5 mm)
Connection cross sec-
tion:
0.5 to 1.5 mm², single-wire, AWG 20 to AWG 14
Connection cross sec-
tion:
0.75 to 1.5 mm², ne-wired, AWG 18 to AWG 14
Connection cross sec-
tion:
0.5 to 1.0 mm², ne-wired
(wire end sleeves with and without plastic collars)
Length of stripped in-
sulation:
9 to 10 mm
Table 2: Connection X5-X7
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Power connections (VAU 4/4 & VAU(w) 7.5/3)
Fig. 8: Power connections 1
VAU 4/4 & VAU(w) 7.5/3
X1 mains
B+ B- brake
resistance
The terminals for the supply cable are located inside the frequency converter. The VAU is
equipped with terminals for connecting a brake resistor.
The conguration may vary depending on the version.
Wire end sleeves with plastic collars and lugs are recommended.
Terminals: Spring force connection
(at head screwdriver, max. width 2.5 mm)
Conductor cross section, rigid min. 0.2 mm²
max. 10 mm²
Conductor cross section, exible min. 0.2 mm²
max. 6 mm²
Conductor cross section, exible
with wire end sleeve without plastic
collar
min. 0.25 mm²
max. 6 mm²
Conductor cross section, exible
with wire end sleeve with plastic
collar
min. 0.25 mm²
max. 4 mm²
2 conductors of identical cross sec-
tion, exible with TWINAEH with
plastic collar
min. 0.25 mm²
max. 1.5 mm²
Conductor cross section AWG/kcmil min. 24
max. 8
Length of stripped insulation: 15 mm
Mounting temperature: -5°C to +100°C
Table 3: Connection X1 (VAU 4/4 & VAU(w) 7.5/3)
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Power connections (VAU 11-22/3)
Fig. 9: Power connections 2
VAU 11-22/3
X1 mains /
X4 motor
The terminals for the supply cable are located inside the frequency converter. The con-
guration may vary depending on the version.
Wire end sleeves with plastic collars and lugs are recommended.
Torque min. 2.5 Nm / max. 4.5 Nm
Conductor cross section: rigid min. 0.5 mm² / rigid max. 35 mm²
Conductor cross section, exible: min. 0.5 mm² / max. 25 mm²
Conductor cross section, exible with wire
end sleeves with plastic collar
min. 1 mm²
max. 25 mm²
Conductor cross section, exible with wire
end sleeves with plastic collar
min. 1.5 mm²
max. 25 mm²
Conductor cross section AWG / kcmil min 20
max. 2
2 conductors of identical cross section,
rigid
min. 0.5 mm²
max. 6 mm²
2 conductors of identical cross section,
exible
min. 0.5 mm²
max. 6 mm²
2 conductors of identical cross section,
exible with AEH without plastic collar
min. 0.5 mm²
max. 4 mm²
2 conductors of identical cross section,
exible with TWINAEH with plastic collar
min. 0.5 mm²
max. 6 mm²
Length of stripped insulation: 18 mm
AWG according to UL/CUL min. 20
max. 2
Table 4: Connection X1 and X 4 (VAU 11-22/3)
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Becker VariAir VAU 4/4 Operating Instructions Manual
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